1 files changed, 56 insertions, 0 deletions
diff --git a/arch/blackfin/boards/ipe337/cmd_alternate.c b/arch/blackfin/boards/ipe337/cmd_alternate.c
new file mode 100644
index 0000000000..2883c77d32
--- /dev/null
+++ b/arch/blackfin/boards/ipe337/cmd_alternate.c
@@ -0,0 +1,56 @@
+#include <common.h>
+#include <command.h>
+#include <linux/stat.h>
+#include <malloc.h>
+#include <fs.h>
+
+#define MAGIC		0x19691228
+
+static int do_alternate(struct command *cmdtp, int argc, char *argv[])
+{
+	void *buf;
+	size_t size;
+	ulong *ptr, val = 0, bitcount = 0;
+
+	if (argc != 2)
+		return COMMAND_ERROR_USAGE;
+
+	buf = read_file(argv[1], &size);
+	if (!buf)
+		return 1;
+
+	ptr = buf;
+	if ((*ptr) != MAGIC) {
+		printf("Wrong magic! Expected 0x%08x, got 0x%08x.\n", MAGIC, *ptr);
+		return 1;
+	}
+
+	ptr++;
+
+	while ((ulong)ptr <= (ulong)buf + size && !(val = *ptr++))
+		bitcount += 32;
+
+	if (val) {
+		do {
+			if (val & 1)
+				break;
+			bitcount++;
+		} while (val >>= 1);
+	}
+
+	printf("Bitcount : %d\n", bitcount);
+
+	free(buf);
+	return (bitcount & 1) ? 3 : 2;
+}
+
+static const __maybe_unused char cmd_alternate_help[] =
+"Usage: alternate <file>"
+"\n";
+
+BAREBOX_CMD_START(alternate)
+	.cmd		= do_alternate,
+	.usage		= "count zero bits in a file",
+	BAREBOX_CMD_HELP(cmd_alternate_help)
+BAREBOX_CMD_END
+